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Process for the production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process

a technology of extruder and microfibrillator, which is applied in the field of process for the production of microfibrillated cellulose, can solve the problems of energy-consuming methods such as shredding or reprocessing fibers

Active Publication Date: 2014-06-10
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enables the production of modified microfibrillated cellulose in a single, energy-efficient step, reducing production time and costs while achieving high dry content and controlled fiber length, facilitating easier transportation and improved properties for paper and board applications.

Problems solved by technology

However, it is very energy consuming method to for example shred or refine the fibers and it is therefore not often used without combining the treatment with a pre- or post-treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018]It has been shown that production of MFC may be done in a extruder. It is thus possible to disintegrate the fibers into microfibrillated cellulose of different length in an easy and efficient way.

[0019]The extruder can be of any kind, for example a single screw, twin screw or conical extruder. It is preferred to use a conical extruder since it has been shown that the high shear forces in a conical extruder results in the production of microfibrillated cellulose in a very energy efficient way. The conical extruder also makes it possible to control the length of the produced microfibrillated cellulose in a good way.

[0020]Conical extruders are traditionally used for application of single or multilayer polymer layers on a co-axial products, profiles and multi-layered films. It can also be used for mixing materials together, such as wood plastics and natural fiber compounds with polymers but not typically targeting actual process of dispersive compounding.

[0021]The typical design o...

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Abstract

The present invention relates to a process for the production of microfibrillated cellulose wherein the process comprises the steps of, providing a slurry comprising fibers, adding the slurry to an extruder, treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed. The invention further relates to a microfibrillated cellulose produced.

Description

[0001]This application is a U.S. National Phase under 35 U.S.C. §371 of International Application No. PCT / IB2010 / 054839, filed Oct. 26, 2010, which claims priority to U.S. Provisional Application No. 61 / 254,887, filed Oct. 26, 2009.FIELD OF THE INVENTION[0002]The invention relates to process for the production of microfibrillated cellulose by the aid of an extruder.BACKGROUND[0003]Cellulosic fibers are multi-component structures made from cellulose polymers, i.e. cellulose chains. Lignin, pentosans, hemicelluloses and other components known in art may also be present. The cellulose chains in the fibers are attached to each other to form elementary fibrils. Several elementary fibrils are bound to each other to form microfibrils and several microfibrils form aggregates. The links between the cellulose chains, elementary- and microfibrils are hydrogen bonds.[0004]Microfibrillated cellulose (MFC) (also known as nanocellulose) is a material made from wood cellulose fibers, agricultural r...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): D21C5/00D21H11/18C08B15/08D21H11/20D21C1/08
CPCD21H11/18D21H11/20
Inventor HEISKANEN, ISTOHARLIN, ALIBACKFOLK, KAJLAITINEN, RISTO
Owner STORA ENSO OYJ
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